ESDS is a new technology that our tests show helps keep sharks at bay. Great for swimmers, divers, surfers, or anybody with an aversion to sharks, everyone! Years in the making, lightweight, rechargeable, Electronic Shark Defense Systems has you covered.

Don't take our word for it, watch our video and decide for yourself. It automatically turns on and off when submerged. Weighing in at only 7 oz, it easily powers through the roughest ocean conditions.

Adam Walker uses ESDS to swim Molokai Channel

Adam Walker conquered the Molokai channel, swimming into Diamond Head at about 11 p.m. on Thursday. It took the 33-year-old 17 hours to do it, although it was supposed to take 12 hours.

The 26-mile swim is considered the third most difficult swim of the "Ocean's Seven."

"That is the hardest swim I have ever done. I've done the English Channel, Morocco, Spain, but uhh... But it's all good. It's all over. Pain just lasts for a day, success lasts for a lifetime that's what they say," said Adam.

The channel crossing was sponsored in part by the makers of an electronic shark defense system. Walker said it worked great. The swim also raised money for two charities.